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spawnl	int spawnl(int mode, char *path, char *arg0, argi, ..., argn, NULL)   mode   path   argO  argn	process.h, stdio.h
spawnie	int spawnle(int mode, char *path, char *arg0, argi, ..., argn, NULL, char *envp[])   mode   path   argO  argn    envp	process.h. stdio.h
spawnip	int spawnlp(int mode, char *path, char *arg0, argi, ..., argn, NULL)   mode   path   argO  argn,    PATH	process.h, stdio.h
spawnipe	int spawnlpe(int mode, char *path, char *arg0, argi, ..., argn, NULL, char *envp[])   mode   path   argO  argn,    PATH    envp	process.h. stdio.h
spawnv	int spawnv(int mode, char *path, char *argv[])   mode   path   argv[]	process.h, stdio.h
spawnve	int spawnve(int mode, char *path, char *argv[], char *envp[])   mode   path   argv[]    envp	process.h, stdio.h
spawnvp	int spawnvp(int mode, char *path, char *argv[])   mode   path   argv[],    PATH	process.h, stdio.h
spawn vpe	int spawnvpe(int mode, char *path, char *argv[], char *envp[])   mode   path   argv[],    PATH   ^ envp	process.h, stdio.h
system	int system(const char *command)  command      	stdlib.h
wait	int wait(int *statloc)       ,   statloc  ,  ID    -1	process.h



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